Open Textbook Library
https://open.umn.edu/opentextbooks https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2023/06/OTL.png
Acceso abierto
Redalyc
https://www.redalyc.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2023/04/Redalyc.png
UNESDOC Biblioteca Digital
https://unesdoc.unesco.org/inicio https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2023/04/Logos-RE-sitio-web-UDB.png
MIT Press Direct
https://direct.mit.edu/books/search-results?f_ContentType=Book&fl_SiteID=5&access_openaccess=true https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2022/08/15.png
Taylor & Francis Group
https://www.taylorfrancis.com/search?key=a&openAccess=true https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2022/05/Captura-de-pantalla-2023-07-14-082140.png
AuthorAID
https://www.authoraid.info/es/ https://biblio.udb.edu.sv/biblioteca//wp-content/uploads/2022/03/authoraid-logo-web-2.png
IEEE OPEN
https://ieeexplore.ieee.org/browse/periodicals/title?returnType=SEARCH&showActiveTitlesOnly=true&fullOA=true/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/09/58.jpg
Zotero
https://www.zotero.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/09/80.png
Mendeley
https://www.mendeley.com/?interaction_required=true https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/09/79.png
Licencias Creative Commons
https://creativecommons.org/licenses/?lang=es https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/09/78.png
REDICCES
http://www.redicces.org.sv/jspui/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/56.jpg
Open Knowledge Repository
https://openknowledge.worldbank.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/55.jpg
La referencia
http://www.lareferencia.info/es/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/54.jpg
CEPAL
https://repositorio.cepal.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/52.jpg
Biblioteca Virtual ODUCAL
https://bibliotecadigital.oducal.com/ https://biblio.udb.edu.sv/biblioteca//wp-content/uploads/2021/06/51.png
Biblioteca Digital Mundial
https://www.wdl.org/es/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/50.jpg
BASE (Bielefeld Academic Search Engine)
https://www.base-search.net/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/49.png
Directorio de la Energía
http://directoriodelaenergia.es/inicio/proyecto.php https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/47.jpg
Biblioteca Virtual en Salud
https://elsalvador.bvsalud.org/ https://biblio.udb.edu.sv/biblioteca//wp-content/uploads/2021/06/45.jpg
Banco Mundial
https://datos.bancomundial.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/44.jpg
Springer Open
https://www.springeropen.com/journals https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/38.jpg
Scientific Electronic Library Online
https://scielo.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/37.jpg
Public Library of Science
https://www.plos.org/abou https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/34.jpg
Medigraphic
https://www.medigraphic.com/cgi-bin/new/medigraphic.cgi https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/33.jpg
Directory of Open Access Books
https://doaj.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/32.jpg
Central American Journals Online
https://www.camjol.info/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2022/10/Logo_CAMJOL_CBUES.png
Case Report in Orthopedic Research
https://www.karger.com/Journal/Home/261897 https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/30.jpg
Betham Open
https://benthamopen.com/browse-by-title/A/1/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/29.jpg
Springer Link
https://link.springer.com/search/page/2?facet-content-type=%22Book%22&from=SL&showAll=false https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/12.jpg
Intech Books
https://www.intechopen.com/books https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/11.jpg
FreeTechBooks
https://www.freetechbooks.com/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/10.jpg
Directory of Open Access Books
https://www.doabooks.org/ https://biblio.udb.edu.sv/biblioteca/wp-content/uploads/2021/06/9.jpg
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